How to Open files .PRG and .CHK

Hello,

What we have done is we created a backup from running PLC 750-8204 by selecting option "Create Backup"
After creating backup, we tried to download it to our new 750-8204 but it is showing error related to firmware mismatch
can anyone help us how can I upgrade/downgrade the firmware of 750-8204 PLC?

waiting
 
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